Open AccessPeculiar velocities of SNe Ia in clusters of galaxies
Author(s) -
Elena Balakina,
M. Pruzhinskaya
Publication year - 2022
Publication title -
astronomy at the epoch of multimessenger studies. proceedings of the vak-2021 conference, aug 23–28, 2021
Language(s) - English
Resource type - Conference proceedings
DOI - 10.51194/vak2021.2022.1.1.140
Subject(s) - supernova , galaxy , physics , distance modulus , velocity dispersion , astrophysics , residual , diagram , hubble's law , dispersion (optics) , statistics , algorithm , globular cluster , mathematics , optics , redshift
The study of the accelerating expansion of the Universe is possible because of the standardization procedure of Type IaSupernovae (SNe). However, we still observe the residual dispersion on the Hubble diagram that could be related toenvironmental eects and unknown peculiar velocities of SNe Ia. In this analysis, we continue to study the peculiar velocitiesof SNe inside galaxy clusters and their inuence on distance modulus measurements. We perform the t for a low redshiftz ≤ 0.15 sample with a xed value of Ω m for C11 and G10 models and calculate wRM S value to estimate the impactof peculiar velocity eect. We get the wRM S = 0.1643 for the C11 sample with SNe Ia in clusters if we use the galaxycluster z cl instead of the host galaxy z host , wRM S = 0.1696 in the original data (for G10 wRM S = 0.1617 and wRM S =0.1643, respectively). The results show the decreasing of residual dispersion on the Hubble diagram. Therefore, this eectis considerable for supernovae in clusters and should be taken into account in future cosmological analyses.